i've faced similar issue, but my pc isn't rebooting, it goes to sleep mode. I'm playing on laptop and when i turned on monitoring of the system while playing - i noticed, that my cpu is always at 100% and eating a lot of power, temperatures are about 85. I researched this behavior and detected that this is some kind of self defence mechanism of my laptop from overheating. Then i tried to limit the power for the cpu - the problem with sleep mode is gone, temperatures are around 70, and i didn't (!) lost performance in game.
Try to enable monitoring of the power consumption when next weekend start, maybe you'll see something similar. And if you can limit power package for you hardware - you can try it
I'm sure that it's not ok that the game punch the cpu so hard
